An introduction to categories in computing by Jay C.B.

The sensible perspective of establishing Java firm structures with J2EE offers the conceptual heritage and wealth of code examples had to truly gather platforms in an invaluable demeanour with the J2EE applied sciences. additionally, this booklet demonstrates how the applied sciences supplement and construct on best of each other through evolution of a cohesive and actual pattern program.

This can be a ebook for these folks who believed that we didn’t have to examine Perl, and now we all know it truly is extra ubiquitous than ever. Perl is intensely versatile and robust, and it isn’t scared of internet 2. zero or the cloud. initially touted because the duct tape of the net, Perl has considering advanced right into a multipurpose, multiplatform language current totally all over: heavy-duty internet purposes, the cloud, structures management, usual language processing, and monetary engineering.

This SpringerBrief introduces the improvement and functional program of a module-oriented improvement framework for area particular system-dynamic libraries (SDL approach), that are utilized in the simulation of multi-causal and dynamic relationships on diversified degrees of an undefined, to illustrate the development undefined.

INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT . . 6); You can create the database using the following command: mysql -u your_username -p your_mysql_password As you can see from Listing 3-3, the schema in this example is quite similar to the previous schemas, except that it gives a bit more information. Each time a game is played, there is an entry in the plays table. Every time a major game event happens, there is a row in the events table. This allows you to analyze the average time it takes the player to achieve each goal.

Fortunately, graphing is a very common task, and several graphing utilities are available. This chapter introduces a few of these utilities, and then demonstrates how to build charts with Gruff, a powerful Ruby-based graphing library. Choosing a Graphing Utility You have many choices for creating charts with Ruby. For example, you can do simple charting in straight Hypertext Markup Language (HTML) and Cascading Style Sheets (CSS). Chapter 7 shows you how to use Markaby, a templating language for Ruby, to create your own HTML bar charts.

25f' % call formats the value as a float # with two decimal points. The String's % operator works # similarly to the C sprintf function. rb. 00 Count 1 4 1 1 As you can see, it’s reasonably trivial to use the calculate function to do simple grouping and report the results. Dissecting the Code Most of Listing 2-2 is code to connect to the database and initialize the models, as you’ve seen in other examples. 2f' % salary}\t#{count} " end Essentially, this code groups by the salary field and counts the ids in each group.